Usually it is not recommended to take a bath in the middle of the night, the middle of the night bath may have a certain impact on the body, such as sleeping difficulties or lead to colds, induced dysmenorrhea, cervical spondylosis and hypoglycemia, etc., and some of the patients with basic diseases of the patient population may be swollen limbs, pain, adverse activities and other symptoms. 1, sleeping difficulties: after the bath there is usually a nerve excitation, resulting in not easy to fall asleep immediately, the difficulty of sleeping. Thus affecting the rest; 2, colds: middle of the night temperature is lower than the daytime, bathing easy to catch a cold, there may be sneezing, runny nose and other cold symptoms; 3, menstrual cramps: female middle of the night bath, cold and dampness is easy to invade the body, which may lead to some of the weak female uterine cold, thus inducing menstrual cramps and other symptoms. You can drink jujube brown sugar water or ginger sugar water to relieve the symptoms of uterine cold, and at the same time to strengthen the warmth, to avoid the cold again; 4, cervical spondylosis: middle of the night bath may lead to the neck cold, local blood vessel contraction, blood flow is reduced, which may induce a recurrence of cervical spondylosis; 5, hypoglycemia: if there is no dinner after dinner, the middle of the night, when the blood glucose is generally at a low level. At this time to take a hot bath, the capillary expansion around the body, too much blood into the peripheral skin, may lead to a drop in blood volume, so that the blood sugar further decline, may induce hypoglycemia in the process of bathing, and dizziness, and in severe cases, may appear fainting. Usual life is recommended to choose to take a bath at about 9:00 pm, when most have finished dinner for a period of time, the food in the stomach is basically digested, absorbed, at this time to take a bath for sleep has a better role in promoting. When taking a bath, you need to pay attention to keep the bathroom ventilated, to avoid indoor production of large amounts of water vapor, resulting in dizziness, breathing difficulties and other symptoms of oxygen deprivation.